class Car:
    def __init__(self):
        self.make = None
        self.model = None

    def set_make(self, make):
        self.make = make

    def set_model(self, model):
        self.model = model

    def display_info(self):
        if self.make and self.model:
            print(f"Car Make: [{self.make}], Model: [{self.model}]")
        else:
            print("汽车品牌和型号尚未设置")

my_car = Car()
my_car.set_make("Toyota")
my_car.set_model("Corolla")
my_car.display_info()

